7.1c Constant and quotient

Same same… but different

 Equilibrium constant Kc

Machine generated alternative text:H2(g)+I2(g)2HI(g)if we take the equilibrium concentrations and process them in the following way:: = coefficient ofHl in tue reaction équation[Fll]qmFH it : 1 = coefficient of H2 in the reaction equation. 2kqmL2icqm . . . .1• 9Pc ° ! in the reaction euatio

 Equilibrium quotient Q

Machine generated alternative text:H2(g)+ Í2(g) 2H1(g)Ifvetake the instantaneous concentrations and process them in the following way:: = coefficient of HI in ti’e reaction equation[HI]2[H2 j 2Ì : 1 = coefficient of H2 in the reaction equation1 9 !z in the reaction equatio

 So what?

Machine generated alternative text:Reactants — ProductsReactants and productsare at equilibrium.Reactants — Products

What about the inverse reaction?

What does it mean to have large Kc? Small Kc?

 

Teacher's note:

  1. Use

Co(H2O)6 2+ + 4 Cl-  + heat equilibrium <--> CoCl4 2- + 6H2O to demonstrate

  1. Kc is the ratio between reactants and products
  2. Kc ONLY change when you change temperature
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